Governor and valve-gear



{No.Model.) l

LE GRAND SKINNER.

GOVERNOR AND VALVEY GEAR.

' No. 287,879. Patented Nv. 8, 1888.

, l I8 q 8 S *i N' Ne UNITED STATES ATENE l @FI-Ioni` LE GRAND sKINNER,oE ERIE, PENNSYLVANIA.

y GOVERNOR AND VALVE-GEAR.

SPECIFICAT'IONforming part of Letters Patent No. 287,879, dated November6, 18l3.

:Application filed April 2G, 1883. (No model.)

To all whom it may concern:

Be it known that I, LE GRAND SKINNER, a citizen of the United States,residing at Erie, in the county 'of Erie and State of f Pennsyl- Vania,have invented certain new and useful Improvements in Automatic Governorsand Valve- Gears for Steam-Engines; VandI dohereby declare the followingto be a full, clear',` and exact description ofthe invention, suchaswilb enable others skilled in the art to which it appertains to makeand use the same.

IIhis invention consists in providing a new and improvedautomaticcut-off-valve gear for steam-engines.'

The scope of the invention will fully appear from following generaldescription and clai1ns.`

Vlevers moved, bythe cams.

The invention -is illustrated in Vthe accompanying drawings as follows:

Figure 1 isa side elevation of the parts which are o`n the shaft of theengine. Fig; 2 is a vertical section takenon the Ydotted line a, lookingtoward the rear of the engine.`

ters as follows:

1 2 3 are parts of the engine-frame. A is the crank-shaft; B and Carecams on the shaft. D is the drive-wheel. E and F are G/is the valveirod. H shows where the exhaust-valve rod would be in case a double valveis used, J is a fixed arm on the shaft. K` is the `centrifugal ball, andK K its connecting links or bars. L

f is a sector-gear, p ivotedatl on the arm of the drive-wheel D.k

The reciprocal movement of the valve-rod is effected by the cams,.G andB acting upon thelevers F and E, as is' fully set forth in a separateapplication of even dateherewith, and need not be minutelyexplainedhere. It, should, however, be kept in mind that the le-` vers F and E inthis instance are kept in contact with the cams by a spring of `somekindas, for instance, -a small steam-cylinder, as shown in the casereferred to,which acts -upon the rod Gr or elsewhere, if desired; and,Aalso,

that the lever E is hung on the lever F, and

hence the lever E is moved by the lever F I Whenever that lever ismoved, as fully set forth in said application.A The movement of thevalve-rod is intermittingly reciprocalf-that is to say, thereciprocations are made up of two distinct movements in `each direction,with a dwell between each separate movement These v with the'valve-gearshown in the other application a governing device which will change therelative positions of the cams as the requirements dictate.

The governi/ng device which I have here employed'is substantially thesame as is shown in a patent issued to me October 17, 1882, and in whichis whatis sometimes called a conibined centrifugal and dynamometricgovernor. There is quite a variety of this class of governors, any ofwhich maybe applied as easily as the one I rhave shown. Where it isdesired to only regulate the engine by or from` 4 its speed, and notlfrom the load upon it directly, a common wheel-governor of any pattern,of which there aremany, maybe used.

The application of any or either of these` will be such that a change inthe position of the centrifugal balls will roll the cam B on the Solshaft, and if a simple dynamometric. governor should be used theapplication will be such that a change in the relative position of thefixed arm and the loose drive-wheel will roll the said cam B. 1 *p As'before stated, the governor here shown is a combined centrifugal anddynamometric,

andthe application is such that any change of speed or of load will rollthe cam B on' the shaft andchange its position relatively to the cam C,which is fixed on the shaft.

The construction here shown is as follows: The cam Gand the arm J areXed on theV shaftA. The cam B is mountedloosely on. the shaft betweenthecam C and the arm J, and on its side is a sleeve, onwhich thedrivewheel D is mounted. The extremity ofthe sleeve of cam B isfurnished with a cog-gear, L', on it. The sector L is pivoted'on thedrivewheel D, and meshes with the cog-gear L on the sleeve of the cam B.The weight-links K K connect the arm J with the arm of the sec- IOO`vtor L, and they also carry the weight K. rlhe arm J and thedrive-wheel D are connected together :flexibly by a spring, S, so as tochange their relative positions as the strain of the belt on thedrive-wheel changes. Any such change of position will cause the sector Lto roll the cam B, and any change of speed will cause the weight K tochange its diametrical position, and thus move the toggles K K, whichwill move the sector L on its pivot Z, and thus roll the cam B. So itwill be seen that any change of speed or of load will affect therelative positions of the cams C and B.

As explained in the application above re ferred to, the gear for movingthe rod G from the cams B and G consists, essentially, of two vibratingparts, F and E, of which F is moved by the fixed cam C, and E is mountedon F, so as to be moved by it, and also independently by the cam B, andthis last-named vibrating part E carries the valve-rod G. rIhe cams onthe shaft have their lifts and drops in opposition, and hence while camG may be moving the part F in one direction the cam B may be moving thepart E in the opposite direction, and thus neutralize more or less thevibration of the valve-rod. The movement, therefore, of the valve-roddepends wholly on the relative positions of the two cams, and thisrelative position is affected automatically by the governor, as beforeshown.

I am aware that it is common io use wheel centrifugal governors, andwheel combined centrifugal and dynamometric governors, and wheeldynamometrie governors to move an eccentric on the shaft, either to rollit or to shift it, and I do not therefore claim as new such applicationsof such governors.

'What I do claim as my invention isl. In the valve-gear of asteam-engine. the combination, substantially as shown, of the followingelements: a mechanicalmovement for converting the continuous rotarymovement of the shaft into an intermitting reciprocal movement of thevalve-rod, consisting of two cams, one of which is variable on theshaft, and two reciprocating parts, one of which is moved by the fixedcam and supports and moves the other reciprocating part,

which is also inoved by the variable cam and carries the valve-rod, awheelgovernor on the shaft, and, finally, means, substantially as shown,for varying said variable cam from said wheel-governor.

2. In the valve-gear of a steam-engine, the combination, substantiallyas shown, of the following elements: a valve-actuating gear `consistingof two cams, one fixed and the other variable on the shaft, and twovibratingparts moved by said cams, one of which supports and carries theother, which latter carries and moves the valve-rod, a centrifugalgovernor mounted on said shaft, and, finally, means, substantially asshown, for varying said variable cam as the weights or balls of saidgovernor change their position centrifugally.

3. In the valve-gear of' a steam-engine, the combination, substantiallyas shown, of the following elements: a valve-actuating gear, consistingof two cams, one fixed and the other variable on the shaft, and twovibrating parts moved by said cams, one of which supports and carriesthe other, which latter carries and nieves the valve-rod, a combinedcentrifugal and dynamonietrie governor on the shaft, and, finally,means, substantially as shown, for varying said variable cam as theparts of said governor are moved by changes in the speed of the engineor the work performed by said engine.

4. In the valve-gear of a steam-engine, the combination, substantiallyas shown, of the following elements: a valveactuating gear consisting oftwo cams, one fixed andthe other variable on the shaft, and twovibrating parts moved by said cams, one of which supports and carriesthe other, which latter carries the valve-rod, a dynamometric governoron the shaft, and, finally, means, substantially as shown, for varyingthe said variable cam, as

the metrical parts of said governor are moved by the exertion of theload upon said governor. In testimony whereof I affix my signature inpresence of two witnesses.

LE GB AND SKINNER.

"Witnesses:

JNO. K. HALLoex, Rom?. H. IoR'rnR,

